Day 2: 11:00 P.M.-12:00 Midnight - S2-E16
Trivia: At the end of the episode, Jack takes Kate out of CTU. When Tony tries to stop them, Jack throws him to the floor and he falls badly on his ankle. Tony spends the rest of the season on crutches. The reason for this is that Carlos Bernard, who plays Tony, broke his ankle playing basketball so the writers had to alter the script to take this into account.
Chosen answer: Nobody knew, not even the writers, until at least halfway through the season when they were writing the end. They wanted to keep all options open.
Nick N.